release.py: use a loop where appropriate.
release.py: use a loop where appropriate.

* tools/dist/release.py
  (RollDep, AutoconfDep, LibtoolDep, SwigDep): Update reference to self.label.
  (build_env): Iterate over the list of deps, rather than doing so manually.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1135468 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion